Underground cable trend identification method and system

Abstract

The invention discloses an underground cable trend identification method and system, and relates to the technical field of electric power inspection and maintenance, and the method comprises the steps: connecting a signal generation unit to the head end of an armor layer of a to-be-identified cable; sleeving a plurality of candidate cables with signal probes, and receiving response signals of the signal probes in real time; loading a sine wave signal to the cable to be identified through the signal generation unit; and according to the response signal and the sine wave signal, obtaining the cable to be identified and the trend thereof from the candidate cables. According to the embodiment of the invention, the current with the same frequency is correspondingly generated in the armor layer of the whole cable, and the response signal is received in real time, so that the trend of the underground cable can be accurately identified, and the underground cable can be maintained and managed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power inspection and maintenance, and in particular to a method and system for identifying the direction of underground cables. Background Art

[0002] With the acceleration of urbanization, underground cables, as an important infrastructure for urban power supply, are increasingly being laid. However, due to the complexity of the underground environment and the concealment of cable laying, cable maintenance and management face huge challenges.

[0003] Due to management limitations, most of the early laid power cable networks had no drawings preserved, on-site markings were damaged during long-term operation, and cables were frequently dug up during road construction.

[0004] When laying cables, usually multiple cables are laid together along the trench instead of one cable being laid independently. Due to the mutual induction of electromagnetic signals, other cables laid along the same route will also have induction signals, which may lead to incorrect path judgment. Traditional cable detection methods, such as electromagnetic induction method and DC resistance method, can locate the cable position to a certain extent, but in complex environments, such as multi-layer pipelines and high-humidity soil, their detection accuracy and efficiency are often limited, and may cause potential damage to the cable itself. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to accurately identify the direction of underground cables, and to provide a method and system for identifying the direction of underground cables. By generating currents of the same frequency in the armor layer of the entire cable and receiving response signals in real time, the direction of underground cables can be accurately identified to maintain and manage underground cables.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a method for identifying the direction of underground cables, comprising:

[0007] Connect the signal generating unit to the head end of the armor layer of the cable to be identified;

[0008] Connecting the signal probes to a plurality of candidate cables and receiving the response signals of the signal probes in real time;

[0009] Loading a sine wave signal to the cable to be identified by the signal generating unit;

[0010] The cable to be identified and its direction are obtained from the candidate cables according to the response signal and the sinusoidal wave signal.

[0011] As an improvement of the above solution, the step of connecting the signal generating unit to the head end of the armor layer of the cable to be identified includes:

[0012] Determining whether the first end of the armor layer has a grounding point;

[0013] If yes, release the grounding point and connect the grounding point when there is no grounding point at the end of the armor layer;

[0014] If not or after the grounding point is released, the signal generating unit is connected to the head end of the armor layer of the cable to be identified.

[0015] As an improvement of the above solution, before the signal probes are sleeved on a plurality of candidate cables and response signals of the signal probes are received in real time, the underground cable direction identification method further includes:

[0016] An initial preset signal is loaded to the cable to be identified through the signal generating unit; the initial preset signal is a signal greater than a preset current threshold.

[0017] As an improvement of the above solution, the step of sleeve-connecting the signal probes on a plurality of candidate cables and receiving the response signals of the signal probes in real time includes:

[0018] Taking all cables in the cable trench through which the cable to be identified passes as candidate cables;

[0019] Connecting a signal probe to each of the candidate cables;

[0020] The response signal of the signal probe is received in real time.

[0021] As an improvement of the above solution, the step of loading a sine wave signal to the cable to be identified by the signal generating unit includes:

[0022] Obtaining a current signal frequency and a current signal power according to the response signal of the signal probe;

[0023] Selecting a preset frequency and a preset power according to the current signal frequency and the current signal power;

[0024] A preset sinusoidal wave signal is loaded onto the cable to be identified through the signal generating unit, the frequency of the preset sinusoidal wave signal is the preset frequency, and the power of the preset sinusoidal wave signal is the preset power.

[0025] As an improvement of the above solution, obtaining the cable to be identified and its direction from the candidate cables according to the response signal and the sine wave signal includes:

[0026] converting the response signal into a current signal;

[0027] Obtaining the cable to be identified from the candidate cables according to the frequency characteristics of the current signal and the frequency characteristics corresponding to the sine wave signal;

[0028] The direction of the cable to be identified is obtained according to the direction of the current signal corresponding to the cable to be identified.

[0029] As an improvement of the above solution, obtaining the cable to be identified from the candidate cables according to the frequency characteristics of the current signal and the frequency characteristics corresponding to the sine wave signal includes:

[0030] Comparing the frequency characteristics of the current signal with the frequency characteristics of the sine wave signal one by one to obtain an identified current signal that is consistent with the frequency characteristics of the sine wave signal;

[0031] The cable to be identified is obtained from the candidate cables according to the cable where the identified current signal is located.

[0032] The embodiment of the present invention further provides an underground cable direction identification system, comprising:

[0033] A signal generating unit access module, used for connecting the signal generating unit to the head end of the armor layer of the cable to be identified;

[0034] A response signal receiving module, used for sleeve-connecting the signal probes on a plurality of candidate cables and receiving the response signals of the signal probes in real time;

[0035] A sine wave signal loading module, used for loading a sine wave signal to the cable to be identified through the signal generating unit;

[0036] The cable direction identification module is used to obtain the cable to be identified and its direction from the candidate cables according to the response signal and the sinusoidal wave signal.

[0037] As an improvement of the above solution, the signal generating unit access module includes:

[0038] A head end grounding point determination unit, used to determine whether the head end of the armor layer has a grounding point;

[0039] A grounding point release unit, used for releasing the grounding point if yes, and connecting the grounding point when there is no grounding point at the end of the armor layer;

[0040] The signal generating unit access unit is used to connect the signal generating unit to the head end of the armor layer of the cable to be identified if the grounding point is not established or released.

[0041] As an improvement of the above solution, the sine wave signal loading module includes:

[0042] A current electrical parameter acquisition unit, used to obtain a current signal frequency and a current signal power according to the response signal of the signal probe;

[0043] A preset signal information selection unit, configured to select a preset frequency and a preset power according to the current signal frequency and the current signal power;

[0044] A preset sinusoidal wave loading unit is used to load a preset sinusoidal wave signal to the cable to be identified through the signal generating unit, the frequency of the preset sinusoidal wave signal is the preset frequency, and the power of the preset sinusoidal wave signal is the preset power.

[0045] Compared with the prior art, the present invention discloses a method and system for identifying the direction of underground cables, which connects a signal generating unit to the head end of the armor layer of the cable to be identified; sleeves a signal probe on several candidate cables, and receives the response signal of the signal probe in real time; loads a sine wave signal to the cable to be identified through the signal generating unit; obtains the cable to be identified and its direction from the candidate cables according to the response signal and the sine wave signal. By adopting the embodiment of the present invention, by generating a current of the same frequency in the armor layer of the entire cable and receiving the response signal in real time, the direction of the underground cable can be accurately identified, so as to maintain and manage the underground cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the steps of a method for identifying the direction of underground cables provided by an embodiment of the present invention;

[0047] Figure 2 It is a structural schematic diagram of an underground cable direction identification system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the specification and claims, it is to be understood that the terms first, second, etc. in the specification and claims are only used for the purpose of describing the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing the order or time sequence. The terms are interchangeable where appropriate. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0050] The embodiment of the present invention provides a method for identifying the direction of underground cables. Figure 1In this embodiment, the underground cable direction identification method is specifically performed through steps S1 to S4:

[0051] S1. Connect the signal generating unit to the head end of the armor layer of the cable to be identified;

[0052] S2, sleeve the signal probe onto a plurality of candidate cables, and receive the response signal of the signal probe in real time;

[0053] S3, applying a sinusoidal wave signal to the cable to be identified through the signal generating unit;

[0054] S4. Obtain the cable to be identified and its direction from the candidate cables according to the response signal and the sinusoidal wave signal.

[0055] In the above scheme, a sinusoidal wave signal is loaded on the cable at the underground end of the underground cable head through the cable armor layer, which can generate a current of the same frequency in the armor layer of the entire cable, and then the response signal of the signal probe is received on the road surface, and the cable direction can be obtained based on the characteristics of the response signal.

[0056] As a preferred implementation, step S1, connecting the signal generating unit to the head end of the armor layer of the cable to be identified, comprises:

[0057] Determining whether the first end of the armor layer has a grounding point;

[0058] If yes, release the grounding point and connect the grounding point when there is no grounding point at the end of the armor layer;

[0059] If not or after the grounding point is released, the signal generating unit is connected to the head end of the armor layer of the cable to be identified.

[0060] Compared with the traditional method of using a coupling coil to load the signal, in an embodiment of the present invention, the signal is added to the armor layer, and the first section of the control access signal is not grounded, while the armor layer at the end of the cable is grounded, so that the received response signal strength is maximized and the surrounding signal strength is relatively small, which is conducive to identifying the direction of the underground cable.

[0061] As a preferred implementation, before step S2, sleeve-mounting the signal probe on a plurality of candidate cables and receiving the response signal of the signal probe in real time, the underground cable direction identification method further includes:

[0062] An initial preset signal is loaded to the cable to be identified through the signal generating unit; the initial preset signal is a signal greater than a preset current threshold.

[0063] Exemplarily, in an embodiment of the present invention, the signal generating unit firstly loads an initial preset signal to the cable to be identified, and the initial preset signal is greater than 1 A. The initial preset signal can be used to verify the validity of the signal probe.

[0064] As a preferred implementation, step S2, sleeve-connecting the signal probes on a plurality of candidate cables and receiving the response signals of the signal probes in real time, comprises:

[0065] Taking all cables in the cable trench through which the cable to be identified passes as candidate cables;

[0066] Connecting a signal probe to each of the candidate cables;

[0067] The response signal of the signal probe is received in real time.

[0068] In the embodiment of the present invention, by installing a signal probe on each cable in the cable trench passed through, it is possible to capture the response signal of the cable armor layer on the road surface.

[0069] Exemplarily, the signal probe captures the signal through a high-precision induction coil, converts the signal into a current signal, and then sends it to a receiver for amplification to obtain a response signal.

[0070] It should be noted that, when the signal probe is capturing signals, a signal frequency may be selected, and information may be captured at the selected signal frequency.

[0071] When there are multiple cables to be identified, different sine wave signals can be loaded on different cables to be identified to distinguish them, and the signal probe captures information according to the signal frequencies of different sine wave signals.

[0072] As a preferred implementation, step S3, loading a sine wave signal to the cable to be identified by the signal generating unit, comprises:

[0073] Obtaining a current signal frequency and a current signal power according to the response signal of the signal probe;

[0074] Selecting a preset frequency and a preset power according to the current signal frequency and the current signal power;

[0075] A preset sinusoidal wave signal is loaded onto the cable to be identified through the signal generating unit, the frequency of the preset sinusoidal wave signal is the preset frequency, and the power of the preset sinusoidal wave signal is the preset power.

[0076] It should be noted that the signal loaded on the cable to be identified may be an initial signal or a preset sinusoidal wave signal. In the embodiment of the present invention, the preset frequency and the preset power may be selected according to the actual application. Exemplarily, the preset frequency is a special frequency, which may be different from the signal frequency of the cable to be identified itself, or different from the signal frequency of the main noise. Different cables may correspond to different preset frequencies, and further the obtained preset sinusoidal wave signals are also different.

[0077] As a preferred implementation, step S4, obtaining the cable to be identified and its direction from the candidate cables according to the response signal and the sine wave signal, includes:

[0078] converting the response signal into a current signal;

[0079] Obtaining the cable to be identified from the candidate cables according to the frequency characteristics of the current signal and the frequency characteristics corresponding to the sine wave signal;

[0080] The direction of the cable to be identified is obtained according to the direction of the current signal corresponding to the cable to be identified.

[0081] Further, preferably, obtaining the cable to be identified from the candidate cables according to the frequency characteristics of the current signal and the frequency characteristics corresponding to the sine wave signal comprises:

[0082] Comparing the frequency characteristics of the current signal with the frequency characteristics of the sine wave signal one by one to obtain an identified current signal that is consistent with the frequency characteristics of the sine wave signal;

[0083] The cable to be identified is obtained from the candidate cables according to the cable where the identified current signal is located.

[0084] In some preferred embodiments, the sinusoidal wave signal is used as a judgment signal for the direction of the cable, the frequency and power of the sinusoidal wave signal are adjusted, and the frequency characteristics of the current signal are compared one by one with the frequency characteristics of the sinusoidal wave signal. The cable corresponding to the signal probe that receives the sinusoidal wave signal is the cable loaded with the sinusoidal wave signal.

[0085] A method for identifying the direction of an underground cable provided in an embodiment of the present invention can accurately identify the direction of the underground cable by generating current of the same frequency in the armor layer of the entire cable and receiving a response signal in real time, so as to maintain and manage the underground cable.

[0086] The embodiment of the present invention provides a system for identifying the direction of underground cables. Figure 2The underground cable direction identification system includes a signal generating unit access module 11, a response signal receiving module 12, a sine wave signal loading module 13 and a cable direction identification module 14, wherein:

[0087] A signal generating unit access module 11 is used to connect the signal generating unit to the head end of the armor layer of the cable to be identified;

[0088] A response signal receiving module 12 is used to sleeve the signal probe onto a plurality of candidate cables and receive the response signal of the signal probe in real time;

[0089] A sine wave signal loading module 13, used for loading a sine wave signal to the cable to be identified through the signal generating unit;

[0090] The cable direction identification module 14 is used to obtain the cable to be identified and its direction from the candidate cables according to the response signal and the sinusoidal wave signal.

[0091] As a preferred implementation, the signal generating unit access module 11 includes:

[0092] A head end grounding point determination unit, used to determine whether the head end of the armor layer has a grounding point;

[0093] A grounding point release unit, used for releasing the grounding point if yes, and connecting the grounding point when there is no grounding point at the end of the armor layer;

[0094] The signal generating unit access unit is used to connect the signal generating unit to the head end of the armor layer of the cable to be identified if the grounding point is not established or released.

[0095] As a preferred embodiment, the underground cable direction identification system further includes an initial preset signal loading unit, which is used to load an initial preset signal to the cable to be identified through the signal generating unit; the initial preset signal is a signal greater than a preset current threshold.

[0096] As a preferred implementation, the response signal receiving module 12 includes:

[0097] A candidate cable selection unit, used for selecting all cables in the cable trench through which the cable to be identified passes as candidate cables;

[0098] A signal probe sleeve unit, used for sleeve-sleeving a signal probe on each of the candidate cables;

[0099] The response signal receiving unit is used to receive the response signal of the signal probe in real time.

[0100] As a preferred implementation, the sine wave signal loading module 13 includes:

[0101] A current electrical parameter acquisition unit, used to obtain a current signal frequency and a current signal power according to the response signal of the signal probe;

[0102] A preset signal information selection unit, configured to select a preset frequency and a preset power according to the current signal frequency and the current signal power;

[0103] A preset sinusoidal wave loading unit is used to load a preset sinusoidal wave signal to the cable to be identified through the signal generating unit, the frequency of the preset sinusoidal wave signal is the preset frequency, and the power of the preset sinusoidal wave signal is the preset power.

[0104] As a preferred implementation, the cable direction identification module 14 includes:

[0105] A current signal conversion unit, used for converting the response signal into a current signal;

[0106] a cable screening unit to be identified, used to obtain the cable to be identified from the candidate cables according to the frequency characteristics of the current signal and the frequency characteristics corresponding to the sine wave signal;

[0107] The cable direction identification unit is used to obtain the direction of the cable to be identified according to the direction of the current signal corresponding to the cable to be identified.

[0108] Further, preferably, the to-be-identified cable screening unit is specifically used for:

[0109] Comparing the frequency characteristics of the current signal with the frequency characteristics of the sine wave signal one by one to obtain an identified current signal that is consistent with the frequency characteristics of the sine wave signal;

[0110] The cable to be identified is obtained from the candidate cables according to the cable where the identified current signal is located.

[0111] An underground cable direction identification system provided by an embodiment of the present invention can accurately identify the direction of the underground cable by generating current of the same frequency in the armor layer of the entire cable and receiving the response signal in real time, so as to maintain and manage the underground cable.

[0112] The present invention may take the form of a computer program product implemented on one or more storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing program code. Computer-readable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include but are not limited to: phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0113] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for identifying the direction of underground cables, characterized in that: include: Connect the signal generating unit to the head end of the armor layer of the cable to be identified; Connecting the signal probes to a plurality of candidate cables and receiving the response signals of the signal probes in real time; Loading a sine wave signal to the cable to be identified by the signal generating unit; The cable to be identified and its direction are obtained from the candidate cables according to the response signal and the sinusoidal wave signal.

2. A method for identifying the direction of underground cables as claimed in claim 1, characterized in that: The step of connecting the signal generating unit to the head end of the armor layer of the cable to be identified comprises: Determining whether the first end of the armor layer has a grounding point; If yes, release the grounding point and connect the grounding point when there is no grounding point at the end of the armor layer; If not or after the grounding point is released, the signal generating unit is connected to the head end of the armor layer of the cable to be identified.

3. A method for identifying the direction of underground cables as claimed in claim 1, characterized in that: Before the signal probes are sleeved onto a plurality of candidate cables and response signals from the signal probes are received in real time, the underground cable direction identification method further includes: An initial preset signal is loaded to the cable to be identified through the signal generating unit; the initial preset signal is a signal greater than a preset current threshold.

4. A method for identifying the direction of underground cables as claimed in claim 1, characterized in that: The step of sleeve-connecting the signal probes to a plurality of candidate cables and receiving the response signals of the signal probes in real time comprises: Taking all cables in the cable trench through which the cable to be identified passes as candidate cables; Connecting a signal probe to each of the candidate cables; The response signal of the signal probe is received in real time.

5. The method for identifying the direction of underground cables according to claim 1, characterized in that: The step of applying a sine wave signal to the cable to be identified by the signal generating unit comprises: Obtaining a current signal frequency and a current signal power according to the response signal of the signal probe; Selecting a preset frequency and a preset power according to the current signal frequency and the current signal power; A preset sinusoidal wave signal is loaded onto the cable to be identified through the signal generating unit, the frequency of the preset sinusoidal wave signal is the preset frequency, and the power of the preset sinusoidal wave signal is the preset power.

6. A method for identifying the direction of underground cables as claimed in claim 1, characterized in that: The step of obtaining the cable to be identified and its direction from the candidate cables according to the response signal and the sine wave signal includes: converting the response signal into a current signal; Obtaining the cable to be identified from the candidate cables according to the frequency characteristics of the current signal and the frequency characteristics corresponding to the sine wave signal; The direction of the cable to be identified is obtained according to the direction of the current signal corresponding to the cable to be identified.

7. A method for identifying the direction of underground cables as claimed in claim 6, characterized in that: The step of obtaining the cable to be identified from the candidate cables according to the frequency characteristics of the current signal and the frequency characteristics corresponding to the sine wave signal comprises: Comparing the frequency characteristics of the current signal with the frequency characteristics of the sine wave signal one by one to obtain an identified current signal that is consistent with the frequency characteristics of the sine wave signal; The cable to be identified is obtained from the candidate cables according to the cable where the identified current signal is located.

8. An underground cable direction identification system, characterized in that: include: A signal generating unit access module, used for connecting the signal generating unit to the head end of the armor layer of the cable to be identified; A response signal receiving module, used for sleeve-connecting the signal probes on a plurality of candidate cables and receiving the response signals of the signal probes in real time; A sine wave signal loading module, used for loading a sine wave signal to the cable to be identified through the signal generating unit; The cable direction identification module is used to obtain the cable to be identified and its direction from the candidate cables according to the response signal and the sinusoidal wave signal.

9. The underground cable direction identification system according to claim 8, characterized in that: The signal generating unit access module comprises: A head end grounding point determination unit, used to determine whether the head end of the armor layer has a grounding point; A grounding point release unit, used for releasing the grounding point if yes, and connecting the grounding point when there is no grounding point at the end of the armor layer; The signal generating unit access unit is used to connect the signal generating unit to the head end of the armor layer of the cable to be identified if the grounding point is not established or released.

10. The underground cable direction identification system according to claim 8, characterized in that: The sine wave signal loading module comprises: A current electrical parameter acquisition unit, used to obtain a current signal frequency and a current signal power according to the response signal of the signal probe; A preset signal information selection unit, configured to select a preset frequency and a preset power according to the current signal frequency and the current signal power; A preset sinusoidal wave loading unit is used to load a preset sinusoidal wave signal to the cable to be identified through the signal generating unit, the frequency of the preset sinusoidal wave signal is the preset frequency, and the power of the preset sinusoidal wave signal is the preset power.

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